Checking & clearing gutterring/downspouts 4 x per year is not as uncommon as people may think it is. If that's what a client wants then so be it as there is generally a good reason for a more frequient service. Mind after saying that 2 x per year is more the norm though on buildings that get blocked quicker than most.
I use to clean a residential clients gutters everytime I cleaned the windows (6 weeks). They had massive trees that shred
their pine needles all year round. There was literally piles of the things in the gutters everytime I cleaned the windows.
I never suggested they had their gutters cleared every 6 weeks, they requested it. Again who am I to say no a good paying customer.
It's a shame they moved to a much bigger house in Virginia water and only want the gutters done twice a year now